function scroll() {
     var title = document.title; 
	 if(title == "" || title == null){
		title = "陕西蓝科生物科技有限公司欢迎您^^";
	 }
     var firstch = title.charAt(0);//取第一个字符
     var leftstr = title.substring(1, title.length); //取第二个到最后这段字符；
     document.title = leftstr + firstch;
}
     setInterval("scroll()",500);